diff --git a/public/mergify-configuration-schema.json b/public/mergify-configuration-schema.json
index 0dfe03eb7f..bfd179d11e 100644
--- a/public/mergify-configuration-schema.json
+++ b/public/mergify-configuration-schema.json
@@ -4056,6 +4056,7 @@
         },
         "batch_size": {
           "$ref": "#/$defs/BatchSizeBounds",
+          "default": 1,
           "description": "The number of pull requests per speculative check in the queue. Either a single integer (fixed size, 1-128) or an object `{min, max}` for dynamic batching: the queue uses `min` when parallel-check slots are plentiful and grows toward `max` to keep the backlog at zero."
         },
         "batch_max_wait_time": {
@@ -4323,6 +4324,7 @@
         },
         "batch_size": {
           "$ref": "#/$defs/BatchSizeBounds",
+          "default": 1,
           "description": "The number of pull requests per speculative check in the queue. Either a single integer (fixed size, 1-128) or an object `{min, max}` for dynamic batching: the queue uses `min` when parallel-check slots are plentiful and grows toward `max` to keep the backlog at zero."
         },
         "batch_max_wait_time": {